Remove multi-stream related code #832

Job	Run time
generate-matrix / generate	7s
Build and Upload wheel / manywheel-py3_9-cuda11_8	7m 11s
Build and Upload wheel / manywheel-py3_9-cuda12_4	7m 19s
Build and Upload wheel / manywheel-py3_9-cuda12_6	7m 13s
Build and Upload wheel / upload / manywheel-py3_9-cuda11_8	37s
Build and Upload wheel / upload / manywheel-py3_9-cuda12_4	30s
Build and Upload wheel / upload / manywheel-py3_9-cuda12_6	36s
install-and-test (3.9, 11.8, 6)	6m 2s
install-and-test (3.9, 11.8, 7)	6m 3s
install-and-test (3.9, 12.4, 6)	7m 30s
install-and-test (3.9, 12.4, 7)	11m 17s
install-and-test (3.9, 12.6, 6)	8m 40s
install-and-test (3.9, 12.6, 7)	6m 14s
	1h 9m 19s

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